package com.jingdianjichi.gateway.exception;

import cn.dev33.satoken.exception.SaTokenException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jingdianjichi.gateway.entitiy.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 网关全局异常处理
 */
@Component
public class GatewayExceptionHandler implements ErrorWebExceptionHandler {
    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public Mono<Void> handle(ServerWebExchange serverWebExchange, Throwable throwable) {
        ServerHttpRequest request=serverWebExchange.getRequest();
        ServerHttpResponse response=serverWebExchange.getResponse();
        Integer code=200;
        String msg="用户无权限";
        if(throwable instanceof SaTokenException){
            code=401;
            msg="用户无权限";
        }else{
            code=500;
            msg="系统异常";
        }
        Result result=Result.fail(code,msg);
        response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
        return response.writeWith(Mono.fromSupplier(() ->{
            //
            DataBufferFactory dataBufferFactory=response.bufferFactory();
            byte[] bytes=null;
            try {
                bytes= objectMapper.writeValueAsBytes(result);
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
            return dataBufferFactory.wrap(bytes);
        }));
    }
}
